The Ptarmigan’s Dilemma: An Exploration into How Life Organizes and Supports Itself by Theberge Mary & Theberge John

Author:Theberge, Mary & Theberge, John [Theberge, John]
Language: eng
Format: epub
ISBN: 9781551993454
Publisher: McClelland & Stewart
Published: 2010-03-15T15:00:00+00:00

1920s: the spacing role of territorial behaviour (Chapter 5);

1930s: the concepts of density dependence/independence, showing that most mortality factors increase in severity with density and invariably end population growth (Chapter 6); 24

1940s: the idea of compensations between mortality factors,25 that is, “if one thing doesn’t get them something else will” (Chapter 8);

1950s: the separation of extrinsic factors (direct environmental) from intrinsic factors (this chapter);

1960s: the recognition that environmental stress can work subtly on animal physiology, behaviour, and gene selection, and an understanding of a difference between proximate and ultimate factors influencing populations (this chapter).

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